Taking a razor to dark matter parameter space at the LHC

Fox, Patrick J.; Harnik, Roni; Primulando, Reinard; Yu, Tien-Tien

doi:10.1103/physrevd.86.015010

Cited by 93 publications

(106 citation statements)

References 35 publications

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“…After the submission of our arXiv paper, the preprint [54] appeared with a discussion claiming that the unitarity constraint of the present paper is in practice unimportant for rather low cutoffs. This conclusion is based on the inspection of the XX invariant mass distribution for a MET search, in the case of a contact operator with Λ ∼ 600 GeV.…”

Section: Note Addedmentioning

confidence: 99%

Unitarity and monojet bounds on models for DAMA, CoGeNT, and CRESST-II

2012

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If dark matter interacts with quarks or gluons, the mediator of these interactions is either directly accessible at the LHC or is so heavy that its effects are encoded in contact operators. We find that the self-consistency of a contact operator description at the LHC implies bounds on the mediator scale stronger than those found from missing energy searches. This translates into spin-independent elastic scattering cross-sections at a level < ∼ 10 −41 cm 2 , with direct implications for the DAMA, CoGeNT, and CRESST-II anomalies. We then carefully explore the potential of monojet searches in the light mediator limit, focusing on a Z model with arbitrary couplings to quarks and dark matter. We find that Tevatron data currently provides the most stringent bounds for dark matter and Z masses below 100 GeV, and that these searches can constrain models for the DAMA, CoGeNT, and CRESST-II anomalies only if the mediator can decay to a pair of dark matter particles.

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Section: Note Addedmentioning

confidence: 99%

Unitarity and monojet bounds on models for DAMA, CoGeNT, and CRESST-II

2012

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“…However, when considering the production of dark matter at particle colliders through high p T visible particles recoiling against invisible dark matter [11][12][13][14][15][16][17][18][19][20][21], the momentum transfer in dark matter pair production events is large enough to render the EFT assumption invalid for a significant range of dark matter masses, couplings, and mediator masses [16,18,20,[22][23][24][25][26][27][28][29]. As the momentum flowing through the production diagram is proportional to both the transverse momentum of the dark matter particles (i.e.…”

Section: Introductionmentioning

confidence: 99%

Scalar simplified models for dark matter

2015

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We introduce a set of minimal simplified models for dark matter interactions with the Standard Model, connecting the two sectors via either a scalar or pseudoscalar particle. These models have a wider regime of validity for dark matter searches at the LHC than the effective field theory approach, while still allowing straightforward comparison to results from non-collider dark matter detection experiments. Such models also motivate dark matter searches in multiple correlated channels. In this paper, we constrain scalar and pseudoscalar simplified models with direct and indirect detection experiments, as well as from existing LHC searches with missing energy plus tops, bottoms, or jets, using the exact loop-induced coupling with gluons. This calculation significantly affects key differential cross sections at the LHC, and must be properly included. We make connections with the Higgs sector, and conclude with a discussion of future searches at the LHC.

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“…The strongest constraints are derived from a jet in the initial state. Within the context of an Effective Field Theory (EFT), the DM production cross-section has a unique mapping onto a DD cross-section for a given operator, which has been used to place constraints on DD of DM [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…The basic idea is to make use of crossing symmetry to relate the scattering cross-section of DM off of nucleons to the production of DM at colliders. The DM is produced with initial state radiation (ISR), whether that be a Z [4,5], photon [6][7][8], jet [9][10][11][12][13][14][15], top [16] or Higgs [17][18][19], allowing a measurement of the missing transverse energy (MET) carried by the DM. The strongest constraints are derived from a jet in the initial state.…”

Section: Introductionmentioning

confidence: 99%

Monojet versus the rest of the world I: t-channel models

Papucci

Vichi

Zurek

2014

J. High Energ. Phys.

102

121

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Monojet searches using Effective Field Theory (EFT) operators are usually interpreted as a robust and model independent constraint on direct detection (DD) scattering cross-sections. At the same time, a mediator particle must be present to produce the dark matter (DM) at the LHC. This mediator particle may be produced on shell, so that direct searches for the mediating particle can constrain the effective operator being applied to monojet constraints. In this first paper, we do a case study on t-channel models in monojet searches, where the (Standard Model singlet) DM is pair produced via a t-channel mediating particle, whose supersymmetric analogue is the squark. We compare monojet constraints to direct constraints on single or pair production of the mediator from multi-jets plus missing energy searches and we identify the regions where the latter dominate over the former. We show that computing bounds using supersymmetric simplified models and in the narrow width approximation, as done in previous work in the literature, misses important quantitative effects. We perform a full event simulation and statistical analysis, and we compute the effects of both on-and off-shell production of the mediating particle, showing that for both the monojet and multi-jets plus missing energy searches, previously derived bounds provided more conservative bounds than what can be extracted by including all relevant processes in the simulation. Monojets and searches for supersymmetry (SUSY) provide comparable bounds on a wide range of the parameter space, with SUSY searches usually providing stronger bounds, except in the regions where the DM particle and the mediator are very mass degenerate. The EFT approximation rarely is able to reproduce the actual limits. In a second paper to follow, we consider the case of s-channel mediators.

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Taking a razor to dark matter parameter space at the LHC

Cited by 93 publications

References 35 publications

Unitarity and monojet bounds on models for DAMA, CoGeNT, and CRESST-II

Unitarity and monojet bounds on models for DAMA, CoGeNT, and CRESST-II

Scalar simplified models for dark matter

Monojet versus the rest of the world I: t-channel models

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